Propylene polymer films and laminates

Abstract

Disclosed are films or sheets comprising a crystalline propylene polymer composition which is comprised of, by weight, (A) from about 30 to 65% of a copolymer of propylene with a C 4-8 alpha-olefin containing from 80 to 98% propylene, and (B) 35-70% of a co- or terpolymer of propylene with ethylene and, optionally, a C 4-8 alpha-olefin having an ethylene content of 5 to 10% when ethylene is the sole comonomer and an ethylene content of 0.5 to 5% and a C 4-8 alpha-olefin content of 1 to 9.5% when both ethylene and a C 4-8 alpha-olefin are used as comonomers. Coextruded films or sheets and laminates wherein at least one layer is a film or sheet as described above, and films or sheets of blends of the propylene polymer composition and an olefin polymer are also disclosed.

What is claimed is: 
     
       1. A film or sheet material of a crystalline propylene polymer composition which consists essentially of, by weight, (A) from about 30 to 65% of a copolymer of propylene with a C 4-8  alpha-olefin containing from 80 to 98% propylene, and   (B) from 35 to 70% of a copolymer consisting of propylene with ethylene having an ethylene content of 5 to 10%, which composition is prepared by sequential polymerization and wherein a laminate of a polypropylene film and of said film or sheet material has a seal initiation temperature from 100 to 110° C.   
     
     
       2. The material of claim 1 wherein (A) is a copolymer of propylene and butene-1. 
     
     
       3. The material of claim 1 wherein (A) is present in an amount of from 35 to 65%, and (B) is present in an amount of from 35 to 65%, by weight. 
     
     
       4. The material of claim 1 wherein (A) is present in an amount of from 45 to 65%, and (B) is present in an amount of from 35 to 55%, by weight. 
     
     
       5. A film or sheet article comprising a base film or sheet of a crystalline homopolymer of a C 2-10  alpha-olefin monomer or of a copolymer of propylene with ethylene or of a copolymer of propylene with a C 4-10  alpha-olefin monomer, or of a copolymer of propylene with ethylene and a alpha-olefin, provided that, when said copolymer is a copolymer with ethylene, the maximum polymerized ethylene content is about 10%, and when said copolymer is a copolymer with a C 4-10  alpha-olefin, the maximum polymerized content thereof is about 20%, and applied to at least one surface of the base film or sheet, a layer of the material of claim 1. 
     
     
       6. A film or sheet article comprising a base film or sheet of a crystalline homopolymer of a C 2-10  alpha-olefin monomer or of a copolymer of propylene with ethylene or of a copolymer of propylene with a C 4-10  alpha-olefin monomer, or of a copolymer of propylene with ethylene and a C 4-10  alpha-olefin, provided that, when said copolymer is a copolymer with ethylene, the maximum polymerized ethylene content is about 10%, and when said copolymer is a copolymer with a C 4-10  alpha-olefin, the maximum polymerized content thereof is about 20%, and applied to at least one surface of the base film or: sheet, a layer of the material of claim 2. 
     
     
       7. A film or sheet article comprising a base film or sheet of a crystalline homopolymer of a C 2-10  alpha-olefin monomer or of a copolymer of propylene with ethylene or of a copolymer of propylene with a C 4-10  alpha-olefin monomer, or of a copolymer of propylene with ethylene and a C 4-10  alpha-olefin, provided that, when said copolymer is a copolymer with ethylene, the maximum polymerized ethylene content is about 10%, and when said copolymer is a copolymer with a C 4-10  alpha-olefin, the maximum polymerized content thereof is about 20%, and applied to at least one surface of the base film or: sheet, a layer of the material of claim 3. 
     
     
       8. A film or sheet article comprising a base film or sheet of a metallic substrate having applied to at least one surface thereof a layer of the material of claim 1. 
     
     
       9. A film or sheet article comprising a base film or sheet of a metallic substrate having applied to at least one surface thereof a layer of the material of claim 2. 
     
     
       10. A film or sheet article comprising a base film or sheet of a metallic substrate having applied to at least one surface thereof a layer of the material of claim 3. 
     
     
       11. A film or sheet material comprising a blend of (1) from about 5 to 45% of a crystalline propylene polymer composition of claim 1; and   (2) from about 95 to 55% of a crystalline homopolymer of a C 2-10  alpha-olefin monomer or of a copolymer of propylene with ethylene or of a copolymer of propylene with a C 4-10  alpha-olefin monomer, provided that, when said copolymer is a copolymer with ethylene, the maximum polymerized ethylene content thereof is about 10%, and when said copolymer is a copolymer with a C 4-10  alpha-olefin, the maximum polymerized content thereof is about 20%.   
     
     
       12. The material of claim 11 wherein (1)(A) is a copolymer of propylene and butene-1. 
     
     
       13. The material of claim 12 wherein (1) is present in an amount from 10 to 30%. 
     
     
       14. A film or sheet material of a crystalline propylene polymer composition which consists essentially of, by weight: (A) from 45 to 65% of a copolymer of propylene with a C 4-8  alpha-olefin containing from 80 to 98% propylene, and   (B) from 35 to 55% of a terpolymer of propylene with ethylene and a C 4-8  alpha-olefin having an ethylene content of 0.5 to 5%, a C 4-8  alpha-olefin content of 1 to 9.5%, wherein the total content of ethylene and C 4-8  alpha-olefin is from 2 to 10%, which composition is prepared by sequential polymerization and wherein a laminate of a polypropylene film and of said film or sheet material has a seal initiation temperature from 100 to 110° C.   
     
     
       15. The material of claim 14 wherein (B) is a terpolymer of propylene, ethylene and butene-1. 
     
     
       16. The material of claim 15 wherein (A) is a copolymer of propylene and butene-1. 
     
     
       17. A film or sheet material comprising a blend of (1) from about 5 to 45% of a crystalline propylene polymer composition of claim 14; and   (2) from about 95 to 55% of a crystalline homopolymer of a C 2-10  alpha-olefin monomer or of a copolymer of propylene with ethylene or of a copolymer of propylene with a C 4-10  alpha-olefin monomer or of a copolymer of propylene with ethylene and C 4-10  alpha-olefin, provided that, when said copolymer is a copolymer with ethylene, the maximum polymerized ethylene content thereof is about 10%, and when said copolymer is a copolymer with a C 4-10  alpha-olefin, the maximum polymerized content thereof is about 20%.   
     
     
       18. A film or sheet material comprising a blend of (1) from about 5 to 45% of a crystalline propylene polymer composition of claim 16; and   (2) from about 95 to 55% of a crystalline homopolymer of a C 2-10  alpha-olefin monomer or of a copolymer of propylene with ethylene or of a copolymer of propylene with a C 4-10  alpha-olefin monomer or of a copolymer of propylene with ethylene and C 4-10  alpha-olefin, provided that, when said copolymer is a copolymer with ethylene, the maximum polymerized ethylene content thereof is about 10%, and when said copolymer is a copolymer with a C 4-10  alpha-olefin, the maximum polymerized content thereof is about 20%.   
     
     
       19. A film or sheet article comprising a base film or sheet of a crystalline homopolymer of a C 2-10  alpha-olefin monomer or of a copolymer of propylene with ethylene or of a copolymer of propylene with a C 4-10  alpha-olefin monomer, or of a copolymer of propylene with ethylene and a C 4-10  alpha-olefin, provided that, when said copolymer is a copolymer with ethylene, the maximum polymerized ethylene content is about 10%, and when said copolymer is a copolymer with a C 4-10  alpha-olefin, the maximum polymerized content thereof is about 20%, and applied to at least one surface of the base film or sheet, a layer of the material of claim 14. 
     
     
       20. A film or sheet article comprising a base film or sheet of a metallic substrate having applied to at least one surface thereof a layer of the material of claim 14.